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arXiv 2201.10163hep-thmath-phmath.MP
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弯曲背景上的(超)共形高自旋场模型

Models for (super)conformal higher-spin fields on curved backgrounds

Michael Ponds

摘要:

本论文致力于构造描述(超)共形高自旋场在弯曲的三维和四维(超)空间上一致传播的理论。在本论文的前半部分,我们系统地推导了各种弯曲时空上任意秩共形场的模型。在三维$(3d)$和四维$(4d)$中的一般共形平坦背景上,我们得到了明显具有规范和Weyl不变量的作用的封闭形式表达式。类似的结果提供了广义共形领域,具有较高的深度规范变换。在三维空间中,共形平坦时空是允许一致传播的最普遍的背景。在四维空间中,人们普遍期望规范不变性可以扩展到巴赫平坦的背景,尽管还没有自旋大于2的完整模型存在。我们证实了这些期望的第一次通过构建一个完整的规范不变模型的共形场具有较高的自旋。在本论文的后半部分,我们利用超空间技术将上述结果推广到具有离壳超对称性的共形高自旋理论。我们的结果还提供了一些新的应用。特别地,在$4d$ anti-de Sitter(AdS $_4$)空间中构造了横投影算子,并证明了它们的极点与部分无质量场相关联.这使我们能够证明,在这样的背景下,(超)共形高自旋动力学运营商因式分解成产品的二阶运营商。在AdS $_3$(super)空间中也得到了类似的结论。最后,我们利用$3d$ Minkowski和AdS(super)空间中的(超)共形高自旋模型建立了拓扑有质量规范理论.

英文摘要:

This thesis is devoted to the construction of theories describing the consistent propagation of (super)conformal higher-spin fields on curved three- and four-dimensional (super)spaces. In the first half of this thesis we systematically derive models for conformal fields of arbitrary rank on various types of curved spacetimes. On generic conformally-flat backgrounds in three $(3d)$ and four $(4d)$ dimensions, we obtain closed-form expressions for the actions which are manifestly gauge and Weyl invariant. Similar results are provided for generalised conformal fields, which have higher-depth gauge transformations. In three dimensions, conformally-flat spacetimes are the most general backgrounds allowing consistent propagation. In four dimensions, it is widely expected that gauge invariance can be extended to Bach-flat backgrounds, although no complete models for spin greater than two exist. We confirm these expectations for the first time by constructing a number of complete gauge-invariant models for conformal fields with higher spin. In the second half of this thesis we employ superspace techniques to extend the above results to conformal higher-spin theories possessing off-shell supersymmetry. Several novel applications of our results are also provided. In particular, transverse projection operators are constructed in $4d$ anti-de Sitter (AdS$_4$) space, and their poles are shown to be associated with partially-massless fields. This allows us to demonstrate that on such backgrounds, the (super)conformal higher-spin kinetic operator factorises into products of second order operators. Similar conclusions are drawn in AdS$_3$ (super)space. Finally, we make use of the (super)conformal higher-spin models in $3d$ Minkowski and AdS (super)space to build topologically massive gauge theories.

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